The Unique Consignment Reference (UCR) is a globally unique number assigned by the World Customs Organisation (WCO) to consignments. It serves as an identifier for the products during entry, exit, import and export procedures. You can read more about how UCR is used in UK trade on the HMRC guidance page.
This unique number ensures compliance with global trade regulations and helps customs authorities manage and process consignments efficiently. The UCR is typically included as part of a customs declaration when goods cross international borders.